Improvement in hypodermic syringes



l. LEITER. Hypodermic Syringes.

Patented Dec. 2,1873.

' duction ofthe plunger will be greatly facilitated.

Y plunger-rod enters the cylinder A 5 F, the tubu- UNITED STATES TENT CFFIC'E.

JOSEF LEITlllt, 0F VIENNA, AUSTRIA, ASSIGNOR T() FERDINAND (r. OTT() ANI) JOHN l--EYNDERS, 0F NEV YORK, N. Y.

IMEROVEVENT IN HVPODERMIC SVRINGES.

S ecilication formino' )n1-tof Lfitms Patent 145.217, dated Decunbcr 2, ISTR' a ilicaiion'liled p h I f l November 1, 1873.

To all whom 'it may concern:

Be it known that I, J osier Lnrrnn, of Vienna, Austria, have invented an Improved Hypoderinic Syringe, of which the following is a specification:

Figure l is a longitudinal section, on an enlarged scale, of the lanccttube of my im proved hypodermie syringe. Fig. 2 is a side view, also on an enlarged scale, of the syringe. Fig.' 8 is a sectional side view on an enlarged scale, showing the syringe applied to the bottle or receptaclefromwhich the liquid is drawn 5 and Fig. 4, a perspective view of the case within which the syringe, bottle, and lancet-tube are placed.

Similar letters of reference indicate corre spending parts in all the figures.

This invention has for its object to improve the construction of the lancct-tubcs of hypodermic syringes, and of the syringe cylinder, that the plunger may be readily introduced t-herein, and the caps iitted upon it without dificulty and with perfect security. The invention consists in enlarging the bore of the cyl` inders conically at the ends, so that the intro- Heretofore the syringe-cylinders were always made of equal internal diameter throughout, and, as the plunger has to fit tightly therein, its application to the cylinder, when once rcmoved, was a matter of exceeding ditliculty, which is avoided by my improved construction. The same feature of enlarged cylinder ends permits, also, the use of conical or plain cylindrical plugs, whereby the cylinder ends are closed, which plugs thus perform their function without being provided with screwthreads, and will always completely fit and secure the cylinder and the attachments thereto.

In the drawing, A represents the cylinder of the syringe. B is its pllmger; C, the graduated plungerrod; D, the plunger-handle 5 E, the lower tubular plug, through which the lar cap, to which the lancet-tube Gis secured; H, a double plug for connecting the cylinder A with the bottle I, from which the liquid is drawn into the cylinder; and J, the tubular plug for the upper end ofthe cylinder A, and for the reception either of the plug F or H. The laneet-tube G is made of steel, of the or dinary form and size, the size lhardly ever eX- cecdin g that of a sewing-needle. The channel or bore of the tube G is, therefore, exceedingly small 5 still I line the interior of this bore with a coating, a', of platinum, which is the metal best adapted for protecting steel against the injurious influences of liquids that may be forced through the lancet-tube. The outside of the tube G is covered and protected by a coating ofnicliel, b, whereby the steel is protected against the iiniuences of the atmosphere, which nickel covering also protects the point d of the lancet, as is more fully indicated in Fig.' 2. The tube G is screwed into, or otherwise rigidly connected with, the plug F, said plug being slightly conical, as shown, or cylindrical, and of such size as to conveniently fit the plug J, which is placed upon the upper end ofthe tube A. The4 tube A, which is made of hard rubber, glass, or equivalent material, has its cylindrical bore slightly enlarged toward the ends, so that the bore will flare outward, as indicated in Fig. 3. That portion of the tubular plug J which enters the bore of the cylinder A may also be slightly conical, so as to iit the flaring part of the bore of A in the manner shown, or may as well be cylindrical. The

as iu Fig. 2, is finally introduced within the cylindrical, or partly conical, bore of the plug J. The other or lower end of the cylinder A is also enlarged, the same as the other end, and receives the plug E, which has a corresponding conical or cylindrical form where it enters the same. These plugs J and E can thus be readily withdrawn from the cylinder A, and will, when applied, properly and tightly fit the same.

.plug F, when the syringe is in position for use,

By this construction, the necessity of hav.

ing screwthreads on the internal bore, and on the said plugs E and J, is dispensed with, and fully as iirm and more convenient a fastening in every respect is produced. The chief object, however, of having the bore of the cylinder at the lower end conical is, that the introduction ofthe plunger B is thereby greatly facilitated, as above already stated.

The bottle I, from which the liquid is to bc drawn, has the double plug H itted into its inouth, the projecting end c of said plug being ot' the same size as the plug F, so that it may be introduced into the bore of J Whenever the cylinder A is to be connected with the bottle I. When the bottle is disconnected, a cap, L, is placed over the part e of the plug H. M is the case, Within which .the syringe and all its appurtenances are to be'packed. In the lid or bottom of this case is secured a cushion or block, N, which has as many grooves formed on its face longitudinally as there are to bc lancet-tubes packed in the case, and which is embraced, at one or more places, by a cord, j', or equivalent yielding substance, such cord extending transversely over the aforementioned groove or grooves.

When the laneet-point is to be itted into the caset is merely inserted into one ofthe grooves beneath the cross-bands j" f, and firmly held in place thereby, and not apt to be injured during the process of introduction or removal..

Y I claim as my invention, and desire to se cure by Letters Patentv l. rlhe cylinder A of a hypoderniic syringe, niade with the enlarged ends to its bore, sub= stantially as and for the purpose herein shown and described.

2. 'The combination of the conical plugs J and E, and of the plunger B and conical plug F With the cylinder A of a hypoderinic syringe, as described.

JOSEF L INTER.

Vit-nesscs:

HERMANN B'InTzc-nn, J osnn MAYER. 

